The architect and buildings manager of the Diocese of Cologne Heinrich Renard (1868–1928) investigated the site in 1899 and discovered the remains of the Byzantine church of "Hagia Sion" and also of other churches. Direction of construction was entrusted to the architect Theodor Sandel, a member of the Temple Society and a resident of Jerusalem. The foundation stone was laid on 7 October 1900. Construction was completed in only ten years; the basilica was dedicated on 10 April 1910 by the Latin Patriarch of Jerusalem.

In 1951 the abbey was separated from the Beuron Congregation and placed under the direct supervision of the Abbot-Primate of the Benedictines in Rome. In 1967 during the Six Days War the abbey came under fire from both sides. Since 1972 a German-language ecumenical "Theological Study Year" has been run in connection with the abbey.

Architecture

The present church is a circular building with several niches containing altars, and a choir. Two spiral staircases lead to the crypt, the site ascribed to the dormition of the Virgin Mary, and also to the organ-loft and the gallery, from where two of the church's four towers are accessible.

Out of regard for the nearby Muslim sacred place of Nabi Da'ud, which now occupies the building in the Upper Room where traditionally the Last Supper took place, the belltower is set far enough away that its shadow does not touch Nebi Da'ud, and is therefore not directly accessible from the church.